filmmakers can "feel free to remake 7aum Arivu". Filming The first schedule of the film was completed in China and those fifteen minutes of the edited film reportedly cost 15 crore. Later, some shots were canned in Trichy and later at Ampa Skywalk, followed by the song Oh Ringa Ringa in Besant Nagar, for which 1000 junior artists were allotted, and a stunt sequence in Perambur. In the process, Suriya had an ankle injury due to which the shot was postponed for three days. Suriya underwent physical training for a kung fu sequence within 16 days, following cinematographer Ravi K. Chandran's request. Shabina Khan designed the costumes for Suriya and Shruti, staying with the team throughout the filming process in Bangkok and Hong Kong. The song "Mun Andhi" was shot in Thailand. Though initial reports stated that the film would feature a time machine, they were later dismissed. The visual effects of the film were done by Legacy Effects at an approximate cost of 10 crore, who had made an impact in Hollywood for their work in the Terminator series, the Jurassic Park series, Aliens, the Predator series, Iron Man, Edward Scissorhands, and Avatar. Music The soundtrack, composed by Harris Jayaraj, consists of six songs including a Chinese track, sung by Chinese singer Wang Hao. It marks the second collaboration of Jayaraj and Murugadoss after the success of Ghajini. Lyrics were penned by Madhan Karky. The audio rights of the album were secured by Sony Music reportedly for a whopping amount. The composition of the soundtrack took place in Singapore. The audio was released on 22 September 2011 in Chennai Trade Centre in a grand manner. The event was hosted by Jai and Anjali, lead pair of Murugadoss' production Engeyum Eppodhum, while Bollywood actress Isha Sharvani, Lakshmi Rai and several international artists performed on stage, which were choreographed by Shobi. Actors Dhanush, Karthi, Jiiva, Jayam Ravi, Vishal and Ram Charan attended the function, with Dhanush releasing the trailer. Though initial reports said that Shahrukh Khan would appear in the launch, it was later dismissed. Critical response P. G. Devi from Behindwoods gave 3.5/5 and commented: "The album promises a couple of big chart-busting hits like the peppy 'Ringa Ringa', the melodious 'Mun Andhi' and the pathos-ridden 'Yamma Yamma'. Though there is a déjà vu feel all around the album, its a sure shot commercial success". Indiaglitz stated that "the unique